Belt for transmitting power.



N0. 642,550. Patented Jan. 30, I900.

F. KENNEDY.

BELT FORTBANSMITTING POWER.

(Application filed June 22, 1899.)

(No Model.)

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UNITED STATES PATENT OFFICE.

PATRICK KENNEDY, on NEW YORK, N. Y.

BELT FOR TRANSMITTING POWER.

SPECIFICATION forming parttof Letters Patent N 0. 642,550, dated January 30, 1900. Application filed June 22, 1899- derial No. 721,437. (No model.)

. the city of New York, borough of Brooklyn,

State of New York, have invented certain new and useful Improvements in Belts for Transmitting Power; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 is a transverse sectional view, in the line 00 w of Fig. 5, of a pulley-and-belt mechanism embracing my said invention. Fig. 2 is a sectional view, on a larger scale and in the line y'y of Fig. 3, of certain parts of the apparatus embraced in my said invention. Fig. 3 is a face view of one of the parts of said apparatus. Fig. 4is a sectional view, in the line .2 z of Fig. 3, of the parts shown in Fig. 2. Fig. 5 is a side view and partial section on a scale corresponding to that of Fig. 1 and illustrating the manner in which the parts shown in Figs. 1 to 4, inclusive, may be applied in connection with an endless strap and circumferentially-channeled pulleys as contemplated in my said invention.

My invention relates to that class of powertransmitting belts in which a system of lugs provided upon an endless strap works in conjunction with pulleys which are grooved or channeled in their peripheries to receive the lugs of the strap.

My said invention comprises certain novel combinations of parts whereby lugs of improved construction are made capableof being securely and firmly made fast in proper position upon the strap and whereby the durability and eflicient operation of the lugs in the operation of the belt are secured.

In the drawings, A and B are two pulleys, from one to the other of which power and motion are to be transmitted. Each of these pulleys is circumferentially grooved or channeled, as at a, the channel a beingpreferably of a V shape in its cross-section, as shown in Fig. 1. The lugs shown at c) are provided upon an endless strap D, as shown in Figs. 1, 2, and 5, the lugs being secured to the strap by rivets at about the middle of their convex surfaces, as at b, and with slight intervals between them, as represented in Fig.

5. As the one pulley revolves the sides or surfaces of its channel grip the logs of the belt with a strong frictional hold and, carrying them along, give a positive motion to the belt, which in its turn and by reason of its lugs in the channel of the other pulley holdin g with strong frictional contact against the sides of said channel communicate with equal positiveness a corresponding rotary motion to the other pulley. The lugs are made hollow and, to secure the best results, with elastic walls provided by the shell 0, hereinbefore described and as illustrated in Fig. 4, and each longitudinally considered has the gen eral form of the sector of a ring, as shown in Figs. 2 and 5. Each lug comprises in its structure a shell 0, which is made of leather or other suitable material capable of being brought or shaped to the requisite contour and in the most effective form of the apparatus possessed of sufficient elasticity to permit a certain resilient action of the lug under the changes and vicissitudes of varying speed and tension on the part of the belt and of difierences and variations in the sizes of the pulleys and the distances apart at which they are required to work. The lugs in their cross-sectioncorrespond in size and shape to the cross-sections of the channelsof the pulleys upon which the belt is designed to run, and the curvature of their concave sides should lie upon an arc correspond ing more or less to those of, the circumferences of the pulleys over which they run. The degree of this curvature may, however, be varied within very Wide limits, according to the circumstances of any particular case.

Each lug is constructed as follows: A metallic plate E is curved in one direction, as shown in Fig. 2, to an arc corresponding with the desired curvature of the convex side of the lug and in a transverse direction is shaped to conform to the shape transversely of the belt,the latter being preferably flat or straight across,'as shown in Figs. 1 and 4. This plate E (shown separately in face view in Fig. 3) is so cut or severed as to provide integral therewith two sets or series of clips (1 and e, which when the plate is fast in position extend from the opposite sides or faces of the plate, and the purposes of which are herein presently explained. The edges of the material whereof the shells c of the lug are formed are folded inward to provide lips or flanges ff, as shown more fully in Fig. 4. The outer surfaces of these flanges are snug against the adjacent end portions of the plate. The clips (1 of the latter are then passed or drawn through the flanges f f, as at a, then turned inward or clenched on the opposite surfaces of said flanges, as at b, and then again turned to complete the clench, as shown at g. The plate E thus provides a strong metal back to the shell, one securely and firmly attached thereto, at a minimum of expense and labor. To attach the lug in proper position upon the endless strap, the clips e of the plate are passed or drawn through the belt and clenched at the opposite side thereof, as shown in Fig. 2 and also in dotted lines in Fig. 4. The clips at and e being integral with the plate, the one set of clips attaching the shell 0 of the lug to the plate and the other set of clips securing the plate itself to V the strap, the entire structure is made firm,

strong, and durable and fitted to resist the strains and rough usage to which power-transmittin g mechanisms are frequently subjected. The belt being tightened upon the pulleys to the requisite degree, the angular ridges of the shells are brought snugly against the bottoms of the channels of the pulleys. This expands the shells laterally, as indicated in dotted outline in Fig. 4, so that their frictional hold upon the sides of the channels and their tendency to slip upon the pulleys are proportionally diminished, the tendency of the sides of the shells to separate from the plates by reason of their lateral spread being eife'ctually resisted by the clips, which being integral with the plates and clenched upon the flanges of the shells are not easily detached from either.

What I claim as my invention is-- 1. As a new article of manufacture a lug for power-transmitting belts composed of a metal plate or back, a shell of the requisite shape having flanges which rest against the metal plate, and means for attaching said flanges to the plate, the whole combined substantially as herein set forth.

2. The combination in a lug for powertransmitting belts of a shell composed of sheet material and having opposing flanges f, fiand a metallic back or plate having integral therewith clips which are passed through and clenched upon the flanges to secure the shell to the plate, substantially as herein set forth.

3. The combination with an endless strap, of a metal plate having integral therewith clips which are passed through and clenched upon the strap, a shell composed of sheet material provided with inwardly-turned flanges which rest against the plate, and means for attaching said flanges to the plate, substantially as herein set forth.

4. The combination with an endless strap and a shell composed of sheet material having inwardly-turned flanges f, f, of a metal plate having integral therewith clips for attaching the plate to the strap and clips for attaching the flanges to the plate, substantially as herein set forth.

5. The combination with an endless strap and a resilient shell composed of sheet material having flanges f, f, of a metallic plate having integral therewith clips which attach said plate to said flanges, substantially as herein set forth.

PATRICK KENNEDY.

lrVitnesses:

E. L. CHANEY, J. A. WHITNEY. 

